Amphibious truck



FIG. 1 is a perspective view of an amphibious truck showing my design;

FIG. 2 is a side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a top plan view; and

FIG. 5 is a rear elevational view. 

The ornamental design for an amphibious truck, substantially as shown. 